No association between physical activity and primary melanoma thickness in a cohort of Norwegian women

Knowledge about factors associated with melanoma thickness, the most important prognostic factor for localized primary melanoma survival,1 may help reduce the risk of melanoma deaths. Previously reported associations of melanoma thickness with pigmentary characteristics, number of naevi, diet quality and body mass index (BMI)2–4 may be explained by behavioural and biological mechanisms. Physical activity (PA) has been associated with improved outcomes for several cancers,5 but its relation with melanoma thickness and prognosis is unknown.